Controlled experiment

The corridor was very quiet. After hanging up the phone, Du Yusheng seemed to be able to hear his own breathing for a while.

He leaned against the wall, lit a cigarette, watched Li Yaoyue getting closer, Du Yusheng stretched out his hand, and waved at him feebly.

"Have you finished your private affairs?" Du Yusheng joked.

Li Yao shook his head calmly, and said with a smile, "Well, it's over."

Du Yusheng blew out a smoke ring, squinted his eyes and smiled at Li Yao, and took a puff of the cigarette, as if all the unhappiness that had been suppressed in his heart had been blown out with the smoke ring, Du Yusheng felt a little more relaxed, and his body was not so stiff .He really wanted to quickly get rid of these things that were pressing on him, and then confess to the man in front of him. After doing this and that on the bed, seeing Li Yao's good figure, no matter who was on top, Du Yusheng's mind had already begun to think about it. couplet.

It seems that I am better at the top. I run out of the field all the year round, and my strength must be stronger than that of the man who sits in the office every day to see patients and undergo surgery.Du Yusheng squinted his eyes and looked up and down Li Yao's body.

But if the other party is Li Yao, no matter where I am, I am willing. Du Yusheng scratched his nose and secretly cursed for himself.

Du Yusheng is particularly prone to blush, and he would prick up his ears redly when there is any disturbance on weekdays, let alone such intense ideological activities.Li Yao looked at the flushed Du Yusheng and frowned, of course he didn't know what was going on in his mind.

Couldn't help calling him.

Du Yusheng turned his head like a lightning strike.

"you call me?"

Li Yao was taken aback by his reply, and nodded belatedly.

"I said I'm going first."

Du Yusheng was immersed in his own brain and couldn't get out. He didn't hear what Li Yao was saying at all, and just nodded dully.

When Li Yaoren disappeared from sight, Du Yusheng realized that he was saying goodbye to you.

Du Yusheng leaned against the wall, almost grinning to his ears.

Calm calm calm calm, he said silently three times in his heart.

Du Yusheng looks at the battle-tested, in fact, he is a pure little virgin in his bones, his little willpower can't withstand any intense brain supplementation, and it is exactly the same, as long as Li Yao moves forward a little bit, Du Yusheng can move forward Walk one meter, to put it bluntly, if the other party doesn't respond, he will be the one who suffers.

Calming his mind, Du Yusheng pondered which one should go first, Chen Xin's autopsy report or the new victim.

After thinking for a long time, Du Yusheng decided to find out the cause of Chen Xin's death first.

As for the new victim, Du Yusheng sent a few people to watch the scene first.

Du Yusheng found Qin Yan in the laboratory.

Qin Yan was wearing a surgical cap and a special autopsy suit. In order to identify whether he died of poison, he did not wear a mask.He has been staying here for the past few days, and with the new murder case in the next door group, some stubbles appeared on Qin Yan's chin.

Greeting Du Yusheng with his rubber-gloved fingers, Qin Yan stood beside Chen Xin's body.

"Is there a result?"

Qin Yan nodded and said, "As you thought, Chen Xin did inhale the drug before he died."

Du Yusheng felt his nose itchy, so he opened the drawer under Qin Yan and took a mask to put on himself.

In the huge laboratory, except for Du Yusheng and Qin Yan, there are all dead people. It's a bit creepy to think about it this way.

"Come and see here."

Qin Yan pointed to Chen Xin's neck for Du Yusheng to see.

On Chen Xin's neck, near the Adam's apple, there are two almost symmetrical indentations.Du Yusheng stood up and took his thumb to compare a few times. He felt that it should refer to the indentation.This kind of trace will appear after a period of time after death, he raised his head and looked at Qin Yan.

"Strangled?" Du Yusheng asked.

Qin Yan shook his head, took off his gloves and threw them into the waste bin next to him.

Turning on the faucet to rinse his hands, Qin Yan found a clean paper towel and wiped his fingers carefully.

Then he pulled out a chair and sat down next to the corpse.

"There is a place in the human body called the carotid sinus, which is probably on the upper edge of the thyroid cartilage. This carotid sinus is very interesting. It is very sensitive to blood pressure and is also a baroreceptor of the human body. It can lower our blood pressure and slow down our heart rate. During paroxysmal supraventricular tachycardia, we press the carotid sinus on one side, which can stimulate the vagus nerve reflex, slow down the heart rate, lower blood pressure, and temporarily relieve paroxysmal supraventricular tachycardia."

Too many medical terms were mixed together, and Du Yusheng was confused. He subconsciously touched his Adam's apple.

Said: "What do you want to say?"

Qin Yan raised his legs and pointed at his neck, saying, "I want to say, what I said above is all about pressing one side of the carotid sinus." He touched his nose and changed the subject : "But what happens if you press on both sides of the carotid sinus at the same time?"

Du Yusheng shook his head dully.

"In most cases, it will make people faint." Qin Yan continued: "If you keep pressing it, you will die. Chen Xin should die like this."

Du Yusheng touched his neck and swallowed subconsciously.

"...Can you still kill like this?"

Qin Yan nodded, and said: "So it must be a homicide, and we guessed it at the scene."

Du Yusheng felt a little scared.

"In a hospital, you can use such a profound method to kill someone."

Qin Yan tilted his head and smiled, "So I guess the murderer is someone with a medical background."

"People from the hospital?" Du Yusheng followed him.

"It may also be the people around you." Qin Yan added: "The people around you have a medical background."

Du Yusheng rolled his eyes and said, "You want to say, it's Li Yao, right?"

Qin Yan shrugged, implying that this is not what I said.

Although Qin Yan didn't say it clearly, Du Yusheng slapped the autopsy report on Qin Yan's desk as if his tail had been stepped on.

"You can doubt him last time, but this time, it really has nothing to do with him, I can assure you."

Qin Yan was not annoyed, but calmly discussed: "What guarantee do you have?"

"When Chen Xin died, I was with Li Yao." Du Yusheng took a deep breath, brushed the hair on his forehead back, and said, "I am his best alibi. The two of us stayed together all night. Together. I also suspected that he had something to do with Chen Xin's death before, but we have been together and he has no time to commit crimes."

What he said was categorical, Qin Yan could only raise his hands high as a gesture of surrender.

Then he scolded Du Yusheng in his heart.

Coming out of the forensic team, Du Yusheng was still touching his neck. He never knew that there was such a method of killing people, which made him feel chilly on his neck. In addition, there was a bit of snow today, and Du Yusheng's clothes were thin , although not many boys wear scarves, Du Yusheng still grabbed a scarf and wrapped it around his neck.

Du Yu was usually a bit rough in his life, and he didn't know how to wear a good-looking tie like other people. He wrapped it around his neck twice randomly to protect his carotid sinus.

When the car stopped at the scene of the crime, it happened to stop at Xiao Bai's feet.

Xiaobai looked at the big red scarf on Du Yusheng's neck with astonishment.

"Brother Yu." Xiaobai pointed to the thing, couldn't bear to look directly at it, and said, "Are you married?"

Du Yusheng rolled his eyes and said, "I have to protect my carotid sinus."

Xiaobai didn't understand, so he blinked and asked belatedly, "Huh?"

It's a pity that Du Yusheng has gone far.

This is a murder case that happened shortly after Chen Xin's death, and the victim died in his own home.

Du Yusheng stretched out his head and took a look. He was an old man with gray hair, lying quietly on his bed as if he had fallen asleep.There wasn't any vomit on the bed or the floor, and there wasn't any poisonous smell.

Colleagues from trace inspection and forensic medicine inside were taking pictures to collect evidence.Du Yusheng didn't have much interest in staying inside.

The old man's home is simple and unpretentious, which is different from this community. The furniture inside is very old, and looks about the same age as the old man.Du Yusheng walked outside the door.

As Xiaobai said, this house number and floor are exactly the same as the last deceased Chen Xin's house. The only difference is that the building numbers of the two people are different. They are next to the adjacent building numbers, one in front and one behind. The design of the community is very interesting. The designer is like a patient with obsessive-compulsive disorder. The same door number on the same floor, when you open the window, you can see the same door number as yourself on the opposite side.Du Yusheng discovered this when he opened the window in the corridor.

In other words, the windows of the old male deceased's house and Chen Xin's house were facing each other, almost in a straight line.

What is this operation?

Du Yusheng kicked Xiaobai.

"Have you asked about the situation?"

Xiaobai rubbed his buttocks, nodded, and said: "The deceased here is a widowed old man. He has a daughter, two sons, and three children rarely come to see him. Neighbors said that sometimes three months Can’t come once, the old man’s wife passed away very early, and he lived alone for so many years.”

"Who found it?"

"It's the milk delivery brother." Xiaobai said: "The milk delivery brother found that the milk that had been accumulated for three days in the milk box at the door had not been touched, so he became suspicious and asked the property manager to come over and open the door. Only then did I find out that the old man had passed away."

Du Yusheng glanced back at the corpse of the old man in the room, and said, "Three days of milk?"

Xiaobai nodded and said, "That's right, the old man passed away four days ago."

four days ago?

He died one day earlier than Chen Xin.

Du Yusheng looked at Xiaobai, and then asked, "What is the cause of death and the exact time?"

Xiaobai sighed, and said: "The forensic team said that it should have happened three nights ago, but there were no suspicious signs on the old man's body or at the scene. Visually, it should be some kind of sudden illness. We are still in contact with the old man's family. Ask the elderly what chronic diseases they have, and there are basically no major problems."

basic.

no big problem?

Du Yusheng didn't think so.

At the scene of the crime, the colleagues inside were busy, so Du Yusheng leaned over to take a look at the bed sheet under the old man.

Except for the outline of the person, it was neat and almost exactly the same as the bed sheet under Chen Xin.

Du Yusheng could almost imagine the results in the next few days. He would find the note of the control experiment in the old man's stomach, and then he would find that the old man committed suicide, and it was also related to the carotid sinus in the neck.Du Yusheng covered his red scarf, his throat moved.

He felt like he was being pushed away, which was a very bad feeling.

Xiaobai threw it at the door to contact his family members, and Du Yusheng walked over to take a look at him.

Said: "The old man died four nights ago, do you still remember when Chen Xin died?"

Holding the phone, Xiao Bai said, "He died three nights ago."

Du Yusheng stretched out a finger, pointed at Chen Xin's house outside the window, and said, "What a coincidence, almost exactly the same apartment type, the same door number, why?"

"...You mean, these two were made by the same person?"

Du Yusheng rolled his eyes and gave Xiaobai a "what do you say" look.

Going through Chen Xin's case in his mind, Du Yusheng thought, no accident, as long as Chen Xin is replaced by the dead old man now, the situation is almost exactly the same.Thinking of this, Du Yusheng began to look at the crime scene again.